Chess3D/program.cpp at master · zigaroula/Chess3D · GitHub

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#include "program.h"

using namespace std;

void Program::init()
{

    const string & _name = "Programme";
    const string & _vertexShaderFilename = "shader.vert";
    const string & _fragmentShaderFilename = "shader.frag";

    id = glCreateProgram();
    name = _name;
    Shader * vs = new Shader(_name + " Vertex Shader", GL_VERTEX_SHADER);
    Shader * fs = new Shader(_name + " Fragment Shader",GL_FRAGMENT_SHADER);
    vs->loadFromFile(_vertexShaderFilename);
    vs->compile();
    attach(vs);
    fs->loadFromFile(_fragmentShaderFilename);
    fs->compile();
    attach(fs);

    glBindAttribLocation(id, 0, "vertex");
    glBindAttribLocation(id, 1, "normal");
    glBindAttribLocation(id, 2, "texture");

    link();
}

void Program::initForShadowMap()
{

    const string & _name = "ProgrammeShadowMap";
    const string & _vertexShaderFilename = "shader_SM.vert";
    const string & _fragmentShaderFilename = "shader_SM.frag";

    id = glCreateProgram();
    name = _name;
    Shader * vs = new Shader(_name + " Vertex Shader", GL_VERTEX_SHADER);
    Shader * fs = new Shader(_name + " Fragment Shader",GL_FRAGMENT_SHADER);
    vs->loadFromFile(_vertexShaderFilename);
    vs->compile();
    attach(vs);
    fs->loadFromFile(_fragmentShaderFilename);
    fs->compile();
    attach(fs);

    glBindAttribLocation(id, 0, "vertex");

    link();

}

void Program::initForSelection()
{

    const string & _name = "ProgrammeSelection";
    const string & _vertexShaderFilename = "selection_shader.vert";
    const string & _fragmentShaderFilename = "selection_shader.frag";

    id = glCreateProgram();
    name = _name;
    Shader * vs = new Shader(_name + " Vertex Shader", GL_VERTEX_SHADER);
    Shader * fs = new Shader(_name + " Fragment Shader",GL_FRAGMENT_SHADER);
    vs->loadFromFile(_vertexShaderFilename);
    vs->compile();
    attach(vs);
    fs->loadFromFile(_fragmentShaderFilename);
    fs->compile();
    attach(fs);

    glBindAttribLocation(id, 0, "vertex");
    glBindAttribLocation(id, 2, "texture");


    link();

}

void Program::attach(Shader * shader) {
    glAttachShader (id, shader->getId());
    shaders.push_back (shader);
}

void Program::detach(Shader * shader) {
    for (unsigned int i = 0; i < shaders.size (); i++)
        if (shaders[i]->getId() == shader->getId())
            glDetachShader (id, shader->getId());
}

void Program::link() {
    glLinkProgram (id);
    GLint linked;
    glGetProgramiv (id, GL_LINK_STATUS, &linked);
    if (!linked) {
        cout << "Shaders not linked" << endl;

        GLint maxLength = 0;
        glGetProgramiv(id, GL_INFO_LOG_LENGTH, &maxLength);

        // The maxLength includes the NULL character
        std::vector<GLchar> errorLog(maxLength);
        glGetProgramInfoLog(id, maxLength, &maxLength, &errorLog[0]);

        for (auto c : errorLog)
            cout << c;
        cout << endl;
    }
}

void Program::use() {
    glUseProgram(id);
}

void Program::stop() {
    glUseProgram (0);
}

void Program::reload() {
    for (unsigned int i = 0; i < shaders.size (); i++) {
        shaders[i]->reload ();
        attach (shaders[i]);
    }
    link();
}